I was talking mostly about technological tiers, Terrans have quite obvious lines drawn between Capella-era tech and TEI tech, with very little blending between the two.
Zods are more diffuse, and more prone to keep retrofitting and upgrading to modern standards their older designs way past the point Terrans would have decommissioned them (remember how the appolo and valk were already decommissioned by Capella, but Seth and Horus upgrades are still in use by the Zod military in the WiH era, and they even deploy Aten cruisers in militarily contested areas). They do not have an equivalent to TEI because they do not think of fleet organization in term of design generations with an expected operational lifetime, scheduled to be replaced every X years (this sentence is obviously an oversimplification of the way Tevs operate, but I think it carries the point across).
Although this is only relevant to the mainstay Zod fleet. The Medjai is an entirely different story.